/*
 * Tuxánci 2 - A first person shooter
 * Copyright (C) 2007-2011  Tuxánci Development Team
 * Copyright (C) 2025-2026  Connor Thomson
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

struct FSInput {
    float3 normal : TEXCOORD0;
};

struct FSOutput {
    float4 out_color : SV_Target0;
};

FSOutput main(FSInput input) {
    float3 light_direction = normalize(float3(-0.45, 0.75, 0.55));
    float light = max(dot(normalize(input.normal), light_direction), 0.0);
    float shade = 0.22 + light * 0.78;
    FSOutput output;
    output.out_color = float4(shade, shade, shade, 1.0);
    return output;
}